CM2 Front Channel Speaker Pair: Enclosure Type: 2-way, vented-box front-channel speakersDrivers: 1x 1 aluminum-alloy high-frequency Nautilus dome tweeter, 1x 6.5 woven Kevlar-cone bass-midrangeFrequency response: 65 Hz-20 kHz, ±3dBImpedance: 8ohms nominal, 3.6ohms minimumSensitivity: 89dB/W/mRecommended amplification: 50-120W into 8ohm unclipped programDimensions: 12.8 x 7.9 x 10.9(HxWxD)Weight: 18.7 lbs (each) CMC Center Channel Speaker: Enclosure Type: 2.5-way, vented-box center-channel speakerDrivers: 1x 1 aluminum-alloy high-frequency Nautilus dome tweeter, 2x 5.5 woven Kevlar-cone bass-midrangeFrequency response: 65 Hz-20 kHz, ±3dBCrossover Frequency: 400 Hz, 4 kHzImpedance: 8ohms nominal, 3.6ohms minimumSensitivity: 89dB/W/mRecommended amplification: 50-120W into 8ohm unclipped programDimensions: 6.9 x 18.1 x 9.1(HxWxD)Weight: 16.5 lbsPort baffles and floor spikes included.